Writing, then, should be continual but not continuous, for those who observe the differentiation between those two adjectives. You need to write frequently, but with fresh eyes on your project at the beginning of every writing session.
I have to stop myself from writing even though I know I could produce more on a particular day, because I know from experience that I will be better on a fresh day. I try not to do much on the project between writing sessions, except to think about planning in the general sense how many more days I need or check a few books I need out of the library.
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